method of sending cookies from a servlet in Java

Posted On
August 30, 2008 by Bindu Badri
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HTTP is a stateless protocol, which makes tracking user actions difficult. One solution is to use a cookie, which is a small piece of data sent by a web browser every time it requests a page from a particular site. Servlets, and CGI scripts, can send cookies when a HTTP request is made - though as always, there is no guarantee the browser will accept it.

Cookies are represented by the javax.servlet.http.Cookie class. Cookie has a single constructor, which takes two strings (a key and a value).

// Create a new cookie

Cookie cookie = new Cookie ("counter", "1");

Adding a cookie to a browser is easy. Cookies are sent as part of a HTTPServletResponse, using the addCookie(Cookie) method. You can call this method multiple times, but remember that most browsers impose a limit of ten cookies, and 4096 bytes of data per hostname.